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reference designLM5021

Texas Instruments LM5021

LM5021 AC-DC Current Mode PWM Controller

Overview

TopologyFlyback Converter
Input voltage8-30 V
Switching frequency135-560 kHz
Output 150 V
IC revisionE

Description

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-endedflyback and forward power converters using currentmode control. The LM5021 features include an ultra- low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, etc.). Additional features includeunder-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope com- pensation, soft-start and oscillator synchronizationcapability. This high performance 8-pin IC has total propagation delays less than 100nS and a 1MHz capable oscillator that is programmed with a singleresistor.

Features

  • Ultra Low Start-up Current (25 µA maximum)
  • Current Mode Control
  • Skip Cycle Mode for Low Standby Power
  • Single Resistor Programmable Oscillator
  • Synchronizable Oscillator
  • Adjustable Soft-Start
  • Integrated 0.7A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2)
  • Slope Compensation for (LM5021-1 Only)
  • Under Voltage Lockout (UVLO) with Hysteresis
  • Cycle-by-Cycle Over-Current Protection
  • Hiccup Mode for Continuous Overload Protection
  • Leading Edge Blanking of Current Sense Signal
  • Packages: VSSOP-8 or PDIP-8

Typical applications

  • Building Automation and White Goods SMPS
  • Audio Amplifiers
  • Industrial Power Conversion
  • SMPS for Smart Meters
  • Isolated Telecom Power SuppliesIsolated Telecom Power Supplies

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
IR(A)
L(µH)
RDC max.(Ω)
VR(V (AC))
VT(V (AC))
Material
L(mm)
W(mm)
H(mm)
Mount
Samples
74435573300
WE-HCI SMT Flat Wire High Current Inductor, 8.7 A, 8 A
Simu­lation
Downloads9 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 9 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Performance Rated Current8.7 A
Saturation Current @ 10%8 A
Saturation Current @ 30%9 A
DC Resistance21.7 mΩ
Self Resonant Frequency9.5 MHz
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Inductance33 µH
DC Resistance23.44 Ω
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MaterialMnZn 
Length18.3 mm
Width18.2 mm
Height8.9 mm
MountSMT 
744825320
WE-CMB Common Mode Power Line Choke, –, –
Simu­lation
Downloads11 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-CMB Common Mode Power Line Choke
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Rated Current3 A
Inductance20000 µH
DC Resistance0.16 Ω
Rated Voltage250 V (AC)
Insulation Test Voltage1500 V (AC)
MaterialMnZn 
Length30 mm
Width21 mm
Height35 mm
MountTHT 
750313248
Flyback Transformer WE-FB, –, –
Simu­lation–
Downloads–
Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer WE-FB
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